Electrical problems - Fish Nautique

Calling all electricians…When I turn on something electrical like the blower, the battery gauge shows a discharge to 11 v and with the motor (351) running the engine gauges increase their readings, i.e. the temp gauge goes from 175 to 190 and the oil pressure goes from 60 to 80. This happens every time I turn on a switch – blower, bulge pump, running lights, etc. turn it off and everything goes back to the normal readings. I plan to take the dash apart this weekend to attempt to fix. I was going to begin to check the switch and gauge connections for tightness and corrosion, anything else? Thanks, Jerry

Thanks, 2, I will look for the "heavy red wire" feeding the dash panel. Where on the engine should I look, I haven't noticed it before?   Jerry

Check for corrosion on the terminals and see if this helps but I believe your main problewm is the Alternator is going out. especialy if it has never been upgraded to the internal regulator sytle alternator.

Thanks for all the good suggestions. Several weeks age I pulled apart several (I believe there were 4) multi wire connectors under the front of the engine consol leading to the gauges and switches, Mark, I will take another look at these as well as the connections to the gauges and switches. I will try to fine the large power wire as Matt suggested, and if this doesn’t work I will check out the alternator as Chris suggested. Thanks again for the help, Jerry

I believe this is a common grounding issue of the instruments. Instruments are all grounded in series. Remove all grounds and clean. Re-intall using dielectric grease.